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i2c/designware: Fix an initialization issue

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The i2c_dw_xfer_init() function requires msgs and msg_write_idx from the
dev context to be initialized.

amd_i2c_dw_xfer_quirk() inits msgs and msgs_num, but not msg_write_idx.

This could allow an out of bounds access (of msgs).

Initialize msg_write_idx before calling i2c_dw_xfer_init().

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Fixes: 17631e8ca2 ("i2c: designware: Add driver support for AMD NAVI GPU")
Cc: <stable@vger.kernel.org> # v5.13+
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250627143511.489570-1-michael.j.ruhl@intel.com
This commit is contained in:
Michael J. Ruhl 2025-06-27 10:35:11 -04:00 committed by Andi Shyti
parent d0b3b7b22d
commit 3d30048958
1 changed files with 1 additions and 0 deletions
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drivers/i2c/busses/i2c-designware-master.c
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@ -363,6 +363,7 @@ static int amd_i2c_dw_xfer_quirk(struct i2c_adapter *adap, struct i2c_msg *msgs,
dev->msgs = msgs;
dev->msgs_num = num_msgs;
dev->msg_write_idx = 0;
i2c_dw_xfer_init(dev);
/* Initiate messages read/write transaction */